Paleontologists have long suspected that some dinosaurs shook their tail feathers to woo mates. And a new analysis of "Romeo and Juliet" -- bird-like oviraptor dinos found locked in a 75-million-year-old embrace -- is yielding new clues about the feathery mating theory.

“Juliet” had shorter and simpler tail bones and was probably a female, according to Parsons, who led the research team.